澜沧江漫湾电站水库诱发地震分析

全面分析了漫湾电站水库蓄水前后,库坝区周围地震活动时空强分布,水库蓄水的水位与库坝区地震活动的动态变化关系,结果表明,漫湾水库诱发地震的时间集中于蓄水后5年内,库水位升降之后1个月左右,库坝区发生高频度的3～4级地震,最大月频次为蓄水前的6倍,最大地震震级为4．6级,空间分布集中于大坝约10km范围内,为快速响应、震群型的诱发地震。     

局地大气能量有效性中的表面扰动位能特征

在局地扰动位能理论工作基础上,进一步研究了与实际地形有关的表面扰动位能部分,理论推导了数学表达式,表明地形和表面热状况是其决定因素。利用再分析资料考察了其气候学和气候变率特征。研究表明,表面扰动位能具有独特的热动力学意义,它的量值与地球表面高大地形密切联系,而其季节变动特点则与表面热状况的季节变化息息相关。高纬度极地地形区域为明显的全年基本不变的负扰动位能分布区,低纬度热带区域则呈现季节变动非常小的正扰动位能分布。表面扰动位能的季节变动和年际变率的极值区都位于北半球中纬度的高大地形区域,夏季达到正的极大值,而冬季则转变成负值区。这一特征在青藏高原区最为典型,其表面扰动位能在时域和频域上均表现出明显的年代际特征,年际变率以2—4a周期为主。     

利用地震和爆破资料反演宁夏及邻区浅层三维速度结构

将有限差分正演及LSQR反演方法应用到宁夏及邻区,利用该区2003-2009年7年间的地震和爆破记录,经过重新细致分析,得到了具有4个以上台站清楚记录到初至波Pg和Pn到时的地震426次、爆破52次,剔除到时离散较大的数据后共有2 788条记录.获得了不同深度的速度平面分布图像以及不同位置的深度速度剖面图像.得出深度0...     

Distribution Characteristics of the Seismicity of Zipingpu Reservoir Region after the Wenchuan Earthquake

815 earthquakes recorded by 12 seismic stations of the Zipingpu reservoir seismic network in 2009 were relocated using the double difference algorithm to analyze the seismic activity of the Zipingpu reservoir.Relocation results show that the earthquakes are concentrated relatively in three zones.The distribution characteristics of focal depth are obviously different among different concentration zones.This means earthquakes in different concentration zones may have different causes.Compared to relocation of...     

Large slip rate detected at the seismogenic zone of the 2008 M_W7.9 Wenchuan earthquake

Repeating microearthquakes were identified along the edge of the rupture area of the 2008 MW7.9 Wenchuan earthquake.Slip rates at depths derived from seismic moments and recurrence intervals are found to be systematically larger than those observed at surface.This large deep slip rate may explain the odds about the occurrence of this unanticipated event.Our observations here suggested that seismic hazard could be underestimated if surface measurements alone are employed.     

Theoretical and experimental study of 3-D initial fracture and its significance to faulting

The experimental results of 3-D fracture under compression are introduced in brief and the theory of stress criterion of 3-D fracture is studied.Methods to imitate initial fractures are developed.It is pointed that there are important defects in the extreme value(EV)method ever proposed by Palaniswamy and Knauss. The major defect lies in that only two Euler angles(2EA)are considered,but another one is neglected.If the variation of all the three Euler angles(3EA)are considered,one can get better result wh...     

利用伸缩仪观测资料检测日本9．0级大地震激发的地球自由振荡

利用河南信阳台和河北张家口台伸缩仪的数字化观测资料,采用功率谱密度估计方法,在没有对资料进行去固体潮处理的情况下,准确获得了2011年3月11日日本9．0级大地震激发的0S4-0S39基频球型自由振荡,并与地球初步参考模型（PREM）的理论自由振荡频率进行了对比,发现实测振荡频率与PREM预测的振荡频率基本符合。     

State Vectors—A New Method for Seismicity Analysis

The concept of state vector stems from statistical physics, where it is usually used to describe the evolution of a continuum field in its way of coarse-graining. In this paper, the state vector is employed to depict the evolution of seismicity quantitatively, and some interesting results are presented The authors investigated some famous earthquake cases (e.g., the Haicheng earthquake, the Tangshan earthquake, the west Kunlun Mountains earthquake, etc.) and found that the state vectors evidently change prior to the occurrence of large earthquakes. Thus it is believed that the state vector can be used as a kind of precursor to predict large earthquakes.     

标本兼治 综合治理 招远市黄金矿业秩序实现根本性好转

招远是全国著名的 “金城”,多年来,受黄金生产巨大利益的驱使和诱惑,黄金资源成为众多不法分子滥采乱掘、哄抢掠夺的目标,由此引发了大量的刑事、治安案件和安全事故及不良的社会现象。为了彻底铲除这颗影响全市政治社会稳定的毒瘤,2001年5月份,招远市委、市政府借全国“严打”之机,在全市范围内进行了大规模依法整顿黄金矿业秩序活动。到目前,历经两年的实践证明,招远的黄金矿业秩序整顿实现了矿业秩序由乱到治、集体经济由弱到强、安全事故由多到少、群众生活由穷到富的历史性转变,为全市经济的可持续发展奠定了坚实的基础。——社会稳定…     

Improvement of the Integrating Velocity-Azimuth Process Single-Doppler Radar Wind-Retrieval Method

Among the single-Doppler radar wind analysis methods,the velocity-azimuth display(VAD),velocityazimuth process(VAP),and uniform wind(UW) methods are widely used because of their simplicity.A general form of the VAD,VAP,and UW methods is the integrating VAP(IVAP) method,which is based on the azimuth uniform-wind assumption.In this study,the IVAP method is improved by applying the method along natural coordinates. The natural coordinates can be chosen to ensure that the tangential and radial winds are unif...